Occultation event with (2797) Teucer, event index number 979
Regions able to see the event: US,RECON,NMexico
Geocentric closest approach at 2025/05/17 07:06:38 UTC
J2000 position of star is 10:46:32.2 +32:58:30
Equinox of date position of star is 10:47:57.1 +32:50:27
Star is 136 degrees from the moon. Moon is 81% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=14.1
Use an exposure time of 1.60 seconds with the standard RECON-QHY system.
SNR of 3.4 per integration for unocculted signal
Expected flux drop is 11% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 17.0 arcsec/hr.
Position angle of asteroid motion is 303.6 degrees
The recommended exposure time corresponds to 25.2 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 29.5 km.
The sky-plane scale is 3335.2 km/arcsec.
Diameter estimates:
103.8 km assuming a 5% albedo, aximum of 6.6 sec for a central chord
42.4 km assuming a 30% albedo, maximum of 2.7 sec for a central chord
Cross-track diameter of 103.8 km used for deployment plan.
Star training set for 2797_Teucer, (2025/05/17 07:07UT) Object RA Dec mag sep mel Regulus 10:09:43.2 +11:50:32 1.3 22.75 138 68Del Leo 11:15:27.3 +20:23:03 2.6 13.88 127 46 LMi 10:54:43.4 +34:04:39 3.8 1.88 134 PPM 075435 10:45:50.3 +32:29:10 7.9 0.57 136 PPM 075456 10:47:34.7 +32:32:06 9.9 0.32 136 2797_Teucer 10:47:57.1 +32:50:27 14.1 135 Positions are for equinox of date
This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 0.8 % chance of getting at least one chord. There is a 0.0% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
| George/Scottsdale | 07:06:50 | -36.7 | Dark | Up | 33.9 | 289.9 | Really Low | 07:01:42-07:07:42 | 115.1 | 0.008 |
This table contains the target star visibility for registered RECON sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 86.6 % chance of getting at least one chord. There is a 75.6% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
| Yuma | 07:07:02 | -37.5 | Dark | Up | 35.7 | 289.6 | Up | 07:02:24-07:08:24 | -12.0 | 0.838 | Kingman/Dolan Springs | 07:06:45 | -35.1 | Dark | Up | 36.2 | 288.0 | Up | 07:02:26-07:08:26 | -24.3 | 0.746 | Lake Havasu City | 07:06:50 | -35.7 | Dark | Up | 36.1 | 288.4 | Up | 07:02:28-07:08:28 | -25.6 | 0.733 | Laughlin/Bullhead City | 07:06:46 | -35.0 | Dark | Up | 36.5 | 287.9 | Up | 07:02:31-07:08:31 | -51.6 | 0.407 | Calipatria | 07:07:01 | -36.9 | Dark | Up | 36.6 | 289.0 | Up | 07:02:37-07:08:37 | -67.3 | 0.222 | Idyllwild | 07:06:59 | -36.2 | Dark | Up | 37.7 | 288.1 | Up | 07:02:38-07:08:38 | -140.8 | 0.001 |
Star training set for 2797_Teucer, (2025/05/17 07:07UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 22.75 138 68Del Leo 11:14:06.7 +20:31:22 2.6 13.88 127 46 LMi 10:53:18.9 +34:12:47 3.8 1.88 134 PPM 075435 10:44:25.3 +32:37:12 7.9 0.57 136 PPM 075456 10:46:09.9 +32:40:09 9.9 0.32 136 2797_Teucer 10:46:32.2 +32:58:30 14.1 136 Positions are for J2000